First functional morphology comparison between two Miocene cricetid mandibles

• Carro-Rodríguez, Patricia María ^[1] ; López-Guerrero, Paloma ^[2] ; Prieto, Jérôme ^[4] ; Álvarez-Sierra, María Ángeles ; Peláez-Campomanes, Pablo ^[3]
  1. [1] Universitat de València

     Universitat de València

     Valencia, España

     
  2. [2] Universidad Complutense de Madrid

     Universidad Complutense de Madrid

     Madrid, España

     
  3. [3] Museo Nacional de Ciencias Naturales

     Museo Nacional de Ciencias Naturales

     Madrid, España

     
  4. [4] Ludwig-Maximilians-University Munich

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• Localización: Spanish journal of palaeontology, ISSN 2255-0550, Vol. 35, Nº. 2, 2020 (Ejemplar dedicado a: SPANISH JOURNAL OF PALAEONTOLOGY), págs. 175-184
• Idioma: inglés
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• Resumen

  • Geometric morphometric allows characterizing complex morphologies in order to quantify the geometry of the structure and facilitate comparisons. It allows performing methods analysing differentiation pattern based on variance, such as the Principal Component Analysis (PCA). For that reason, it has been chosen as the method to analyse the mandibles of two extinct species of cricetids rodents: Cricetodon aff. aureus and Megacricetodon minor from the MN6, middle Miocene from Goldberg and Steinberg (Germany). We performed a digitisation of 18 landmarks that resumes the most relevant characteristics of these mandibles. We also performed a measure of the mechanical advantage and potential of the mandibles. In that way, we have been able to quantify notorious morphological differences on the angular and condylar processes and the lower masseter insertion and establish significant differences among the biomechanical behaviour of the mandibles. Later, we can relate the morphological and biomechanical information with speed and force biting.